Wearing a helmet is all about impulse, change in momentum and the force of impact. This video illustrates why you should secure your helmet to your head. Thank you very much to Colton and Jean Johnson who said yes when I asked them if I could film ...myself riding my bike off their dock. Colton also said, “In my 75 years of living, that has got to be the strangest request I have ever received.” Thank you also to Chris Palmer and Larry Braak for being my on-site camera operators.
Content Times:
0:19 Are you wearing your helmet?
0:53 Riding my bike off the dock into the lake. :)
2:15 The helmet falls off
2:40 Newton’s 2nd Law
4:08 Impulse approximation
5:01 Which variables are NOT dependent on helmet status
6:23 Impulse
7:01 What variables does wearing a helmet change
7:57 This one time I was riding my bike …
8:50 A contrasting story
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The Classic Bullet Projectile Motion Experiment
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Dropping Dictionaries Doesn’t Defy Gravity, Duh!
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A 73 kg mr.p steps off a 73.2 cm high wall. If mr.p bends his knees such that he stops his downward motion and the time during the collision is 0.28 seconds, what is the force of impact caused by the ground on mr.p? Want lecture notes? This is an AP ...Physics 1 Topic.
Content Times:
0:21 Translating the problem
1:32 Splitting the problem into parts
3:07 Substituting in known variables
4:30 Finding the final velocity for part 1
6:21 Substituting back into Force of Impact equation
7:23 Converting to pounds
Next Video: Impulse Introduction or If You Don't Bend Your Knees When Stepping off a Wall
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Previous Video: Instantaneous Power Delivered by a Car Engine - Example Problem
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Now that we have learned about conservation of momentum, let’s apply what we have learned to an “explosion”. Okay, it’s really just the nerd-a-pult launching a ball while on momentum carts.
Want lecture notes?
This is an AP Physics 1 Topic.
Conte...nt Times:
0:38 The demonstration
1:16 The known values
2:07 Solving the problem using conservation of momentum
4:00 Measuring the final velocity of the nerd-a-pult
4:39 Determining relative error
5:09 What happens with a less massive projectile?
Next Video: Introduction to Elastic and Inelastic Collisions
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Previous Video: Introduction to Conservation of Momentum with Demonstrations
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Rearranging Newton’s Second Law to derive the force of impact equation. Want lecture notes? This is an AP Physics 1 Topic.
Content Times:
0:09 Newton’s Second Law
1:57 The Force of Impact equation
2:33 The paradigm shift
Next Video: Calculatin...g the Force of Impact when Stepping off a Wall
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Previous Video: Instantaneous Power Delivered by a Car Engine - Example Problem
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An elastic collision is demonstrated and analyzed.
Want lecture notes?
This is an AP Physics 1 Topic.
A big thank you to Mr. Becke for being a guest in today’s video!
Content Times:
0:25 Reading and translating the problem
1:17 The demonstrati...on
1:52 Solving for velocity final of cart 2
3:46 Measuring the velocity final of cart 2
4:25 Checking if kinetic energy is conserved
6:22 We should have converted to meters per second
Next Video: Demonstrating Impulse is Area Under the Curve
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Previous Video: Introductory Perfectly Inelastic Collision Problem Demonstration
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Thank you to my Quality Control help: Christopher Becke and Jennifer Larsen[more]

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